Replies

1. 
   DanH | Jun 30, 2010 06:24pm | #1

   I've used the "elastomeric"

   I've used the "elastomeric" stuff in the past to wrangle another year or three out of a failing shingle job.  Ugly as sin, but it seems to work.

   Do any required spot patching first, and use fiberglass fabric (they sell the stuff for this job, like wide FG drywall tape) across any cracks.

2. 
   junkhound | Jun 30, 2010 06:34pm | #2

   henry's 107, followed by any aluminized coating.

3. 
   Piffin | Jun 30, 2010 06:56pm | #3

   Ok

   I had a 20 year career (?) in roofing before movinmg up to remodeling.

   Sounds like you mean granules, not grains. That means it is about to give up the ghost. Sometoimes a coating can extend the life of a decent roof, but can never replace a bad roof. Your situation sounds borderline....

   Is the exposure on thise 34" or 18"

   What is the pitch?

   What is the climate?

4. 
   k1c | Jul 13, 2010 12:59am | #4

   Loose granules in the gutter does not mean the roofing change.  How old is the roofing? 

   I put epdm sheets on my parents house (cold adhesive) and a few years later I rolled on white elastomeric roof coating, thinking white coating will keep the roof that much cooler.  The coating had good adhesion but it is my observation that coating made the roofing to roofing overlap joint fail.  I don't mean that overlap came apart, but that line along the one roofing and the roofing over it began to crack here and there.  The area where I did not apply the coating (because underneath is a carport) did not have these cracks.  This is just my observation, however, and maybe the conditioned living room underneath had something to do with it, maybe moisture?  But anyway, these roof coating may be more trouble and cost than worth.  Hope it helps.

1. 
   DanH | Jul 13, 2010 07:51am | #5

   I've observed that the cracks in standared shingles tend to occur over joints in the sheathing.

   As to using a white coating to reduce temps, I've always suspected that the effect is negligible, and the money is better spent on additional attic insulation.  The main reason one would use a roof coating is to extend the life of an already-failing roof by 2-3 years.

   You are right, though, that granules in the gutter are not an indication of failure -- some roofing will have a lot of loose granules and will shed quite a few when still new and in good condition.  The thing to look at is whether the roofing is "going bald" in spots.

   The other major sign of failure on standard shingle roofs is curling up at the corners.  (Of course, leaks are also a sign of failure, but not alway so obvious from the outside.)

2. 
   seeyou | Jul 13, 2010 07:52am | #6

   The area where I did not apply the coating (because underneath is a carport) did not have these cracks.

   The reason the the part under the carport didn't crack is it was protected from UV rays which is the primary nemesis of EPDM and the joints are the 1st thing to fail. What you witnessed likely had nothing to do with the coating.

1. 
   DanH | Jul 13, 2010 07:56am | #7

   Yeah, a good point is that the cracks likely occurred due to heating/cooling stresses and the carport stays cooler and at a more uniform temp.

2. 
   Piffin | Jul 13, 2010 07:38pm | #8

   Hi Grant
   Long time no see'um.

   I'm thinking this guy doesn't actually have a "crack", but that the application of the cooling coating let the EPDM shrink a bit, which simply exposed uncoated black material at the edge of the seam.

   But not sure - from some of his terminology, usage, he is not all that familiar with EPDM so it is vaguely possible too that either he used another "rubber" product or that he did not use an elastomeric coating, and the two were incompatible with each other.

   Gonna be missing seeing you at Rezfest, but Gunner 'splained your work load.

1. 
   Piffin | Jul 13, 2010 07:51pm | #9

   Hmmm...new BT forum glitch
   I used paragraphing in my message to CU, but it got reformated in the actual post with no paragraphing...

   So let's see if this one gets the same treatment.

1. 
   calvin | Jul 14, 2010 06:12am | #10

   I used paragraphing in my message to CU

   What you mean?  Hit the return key or used that html stuff?

   Seems Rebeccah had that problem a while back.  For me, the source button causes/changes wysiwyg.